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\bibitem{Martin_etal1994} {\textquotedblleft}\textit{The anharmonic-force field of thioformaldehyde, h2cs, by ab-initio methods}{\textquotedblright}. Martin JML, Francois, Gijbels R, Journal of molecular spectroscopy \textbf{168}, 363 (1994).   http://doi.org/10.1006/jmsp.1994.1285

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